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Excited-state proton transfer in 2-(2'-hydroxyphenyl)benzothiazole: formation of the anion in polar solvents

✍ Scribed by T. Elsaesser; B. Schmetzer

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 630 KB
Volume: 140
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)80459-1

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✦ Synopsis

Excited-state proton transfer in 2-(2'-hydroxyphenyl)benzothiaxole (HBT) dissolved in pyridine is investigated. New absorptions and fluorescence bands are detected after addition of water or NaOH to the solution. The spectra are identical to the HBT anion absorption and fluorescence. Picosecond spectroscopy is used to determine the kinetics of electronically excited states. The excited-state lifetime of the anion is 3.5 ns. The tautomeric fluorescence of HBT after proton transfer builds up within 4 ps after excitation and decays with a time constant of 20 ps.

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